S-8520A31MC-AVQT2G

Overview

The S-8520A31MC-AVQT2G is a CMOS step-down switching regulator controller manufactured by ABLIC Inc. It utilizes Pulse Width Modulation (PWM) control to provide low-ripple power and high efficiency. The device operates within an input voltage range of 2.5 V to 10 V and supports a maximum switching frequency of 375 kHz. It features a fixed output voltage setting of 3.1 V, with a maximum drive current capability of 50 mA for external power components. The component is housed in a compact SOT-23-5 package and is designed for operation across a temperature range of -40°C to +85°C.

Feature Summary

• Integrates PWM control circuitry capable of varying the duty ratio linearly from 0% up to 100% for precise regulation.
• Includes an internal error amplifier and soft-start circuit to prevent output overshoot during startup.
• Operates as a standalone controller requiring only external Pch power MOS FETs or PNPs, coils, capacitors, and diodes.

Applications

• Battery-powered portable electronic devices requiring efficient step-down conversion.
• Embedded systems utilizing microcontrollers that require stable voltage regulation.
• Industrial equipment control circuits operating within standard automotive temperature ranges.

Procurement Notes

Verify the specific suffix AVQT2G against official ABLIC documentation to confirm tape-and-reel packaging and marking codes. Confirm RoHS compliance status directly with the manufacturer's latest datasheet revision. Ensure design-in compatibility with external driver requirements before procurement.

Selection Notes

Select this component when a dedicated PWM-controlled buck converter topology is required rather than a fully integrated LDO or synchronous switcher. It is suitable for designs where minimizing external component count while maintaining high efficiency under variable loads is critical. Verify that the external MOSFET selection aligns with the 50 mA drive limit.

Part Context

This part belongs to the S-8520/8521 series of switching regulator controllers. While the S-8521 variant offers dual-mode PWM/PFM control for light-load efficiency, the S-8520 series focuses on pure PWM control for consistent ripple performance. This family allows designers to build custom DC-DC converters using minimal external passive components.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material. Consult ABLIC technical support for direct replacements or cross-reference compatible PWM controllers based on the 2.5V-10V input range and SOT-23-5 footprint.

FAQ

Does the S-8520A31MC-AVQT2G include an internal power switch?

No, it is a controller IC that requires external Pch power MOS FETs or PNP transistors to handle the load current.

What is the maximum switching frequency supported by this device?

The device supports a maximum switching frequency of 375 kHz.